AirHint found the following cheapest return flights from Washington (IAD) to Rio Negro (MDE) in December 2025 (see full year).

Return flights

16 Dec - 23 Dec	Copa
30 Dec - 17 Jan	Frontier Airlines
14 Dec - 31 Dec	Avianca
14 Dec - 18 Dec	Avianca
17 Dec - 21 Dec	Avianca
23 Dec - 28 Dec	Allegiant Air
15 Dec - 19 Dec	Allegiant Air
23 Dec - 27 Dec	Allegiant Air
30 Dec - 07 Jan	Frontier Airlines
24 Dec - 31 Dec	Allegiant Air
24 Dec - 27 Dec	Avianca
22 Dec - 26 Dec	Breeze Airways
29 Dec - 01 Jan	Allegiant Air
17 Dec - 18 Jan	Frontier Airlines
26 Dec - 01 Jan	Avelo Airlines
29 Dec - 02 Jan	Allegiant Air
26 Dec - 06 Jan	Avelo Airlines
25 Dec - 06 Jan	Frontier Airlines
13 Dec - 04 Jan	Frontier Airlines
26 Dec - 02 Jan	Frontier Airlines

Also check the deals for one-way flights from Washington to Rio Negro in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Washington to Rio Negro in December from $311

Return flights